From 6f0320a9535bc1aa81d83fa879ac14d5ee603658 Mon Sep 17 00:00:00 2001 From: William Wilgus Date: Fri, 27 Jul 2018 23:56:32 +0200 Subject: As3525 v1/v2 Add power savings menu Allow user to select cpu undervolt There have been quite a few issues across the SANSA AMS line related to CPU undervolting while most players show greatly increased runtime some crash. Rather than constanly upping the voltage we now have a setting with a safe value for all players and the option for lower voltages I plan to add a few other options here later such as disk timings and maybe some other clocks/experimental settings Added: Disk Low speed option for AS3525v2 devices cuts frequency to 12 MHz from 24 MHz Added: Disk Low speed option for AS3525v1 devices cuts frequency to 15.5 MHz from 31 MHz Added: I2c Low Speed AS3525 devices, should be bigger improvement for v1 devices Fixed: Debug menu for AS3525v2 No SDSLOT frequency, Showed IDE freq though it is unused Added: DBOP and SSP underclocking affects display on v1/v2 respectively Fixed: debug menu now has SSP frequency, and SSP_CPSR Update: made settings menu more generic Update: cleaned up code Added: Clip v1 & Fuze v1 didn't have HAVE_ADJUSTABLE_CPU_VOLTAGE. not sure why but, waiting on testing to confirm Added: C200v2 and E200v2 devices and HAVE_ADJUSTABLE_CPU_VOLTAGE. Fixed: v1 devices don't like display timing set lower (dbop) v1 devices don't have a divider set for ssp (causes divide by 0) Fixed: ClipZip display lags with Max SSP divider changed from 0xFE to 0x32 Fixed: v1 devices didn't work properly with highspeed sd cards Added code from http://gerrit.rockbox.org/r/#/c/1704/ Added powersave and IDE interface enable/disable Added: V2 devices now have powersave enabled on sd interface Update: cleaned up code, lang defines, added manual entries Update ssp clock mechanism added calculated ssp divider to clipzip Update turn display clock off when clip+ turns off display Fixed: clipzip wrong register for SSP clock Change-Id: I04137682243be92f0f8d8bf1cfa54fbb1965559b TODO: add other players? --- .../arm/as3525/sansa-clipplus/lcd-clip-plus.c | 23 +++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'firmware/target/arm/as3525/sansa-clipplus') diff --git a/firmware/target/arm/as3525/sansa-clipplus/lcd-clip-plus.c b/firmware/target/arm/as3525/sansa-clipplus/lcd-clip-plus.c index a50a9e5c80..7c0cfb5345 100644 --- a/firmware/target/arm/as3525/sansa-clipplus/lcd-clip-plus.c +++ b/firmware/target/arm/as3525/sansa-clipplus/lcd-clip-plus.c @@ -26,11 +26,25 @@ #include "system.h" #include "cpu.h" +static void ssp_set_prescaler(unsigned int prescaler) +{ + int oldlevel = disable_interrupt_save(IRQ_FIQ_STATUS); + /* must be on to write regs */ + bool ssp_enabled = bitset32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE) & + CGU_SSP_CLOCK_ENABLE; + SSP_CPSR = prescaler; + + if (!ssp_enabled) /* put it back how we found it */ + bitclr32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE); + + restore_irq(oldlevel); +} + int lcd_hw_init(void) { bitset32(&CGU_PERI, CGU_SSP_CLOCK_ENABLE); - SSP_CPSR = AS3525_SSP_PRESCALER; /* OF = 0x10 */ + ssp_set_prescaler(AS3525_SSP_PRESCALER); /* OF = 0x10 */ SSP_CR0 = (1<<7) | (1<<6) | 7; /* Motorola SPI frame format, 8 bits */ SSP_CR1 = (1<<3) | (1<<1); /* SSP Operation enabled */ SSP_IMSC = 0; /* No interrupts */ @@ -115,3 +129,10 @@ void lcd_enable_power(bool onoff) #endif } +#if defined(CONFIG_POWER_SAVING) && (CONFIG_POWER_SAVING & POWERSV_DISP) +/* declared in system-as3525.c */ +void ams_ssp_set_low_speed(bool slow) +{ + ssp_set_prescaler(slow ? AS3525_SSP_PRESCALER_MAX : AS3525_SSP_PRESCALER); +} +#endif -- cgit v1.2.3